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2021 JEE PYQ

Get chapter-wise JEE Main & Advanced questions with solutions

Q JEE MAIN 2021
The inactivation rate of a viral preparation is proportional to the amount of virus. In the first minute after preparation, 10\% of the virus is...
JEE Main Chemistry Medium
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Q JEE-MAIN 2021
If force (F), length (L) and time (T) are taken as the fundamental quantities, Then what will be the dimension of density :
JEE Main Physics Easy
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Q JEE MAIN 2021
Number of electrons present in 4 f orbital of $\mathrm{Ho}^{3+}$ ion is $\_\_\_\_$ (Given Atomic No. of $\mathrm{Ho}=67$ )
JEE Main Chemistry Easy
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Q JEE MAIN 2021
Clean water could have BOD value of less than 5 ppm whereas highly polluted water could have a BOD value of 17 ppm or more.
JEE Main Physics Easy
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Q JEE MAIN 2021
To synthesise 1.0 mole of 2-methylpropan-2-ol from Ethylethanoate $\_\_\_\_$ equivalents of $\mathrm{CH}_3 \mathrm{MgBr}$ reagent will be required. (Integer value)
JEE Main Chemistry Easy
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Q JEE MAIN 2021
An accelerated electron has a speed of $5 \times 10^6 \mathrm{~ms}^{-1}$ with an uncertainty of $0.02 \%$. The uncertainty in finding its location while in...
JEE Main Chemistry Easy
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Q JEE-MAIN 2021
Match List-I with List-II
JEE Main Physics Easy
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Q JEE MAIN 2021
The number of nitrogen atoms in a semicarbazone molecule of acetone is _________.
JEE Main Chemistry Easy
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Q JEE MAIN 2021
$2 \mathrm{SO}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{SO}_3(\mathrm{~g})$
In an equilibrium mixture, the partial pressures are
$\mathrm{P}_{\mathrm{SO}_3}=43 \mathrm{kPa} ; \mathrm{Po}_{\mathrm{O}_2}=530 \mathrm{~Pa}$ and
$\mathrm{P}_{\mathrm{SO}_2}=45 \mathrm{kPa}$. The...
JEE Main Chemistry Medium
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Q JEE MAIN 2021
A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy...
JEE Main Chemistry Easy
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